Updated 2 Nov 2026 · recomputed nightly
Is December 2026 a good month to visit San Diego?
Lively — the typical December day in San Diego is calmer than 51% of its year.
If you are coming for something that only happens in December, that is the trade. If not, January is quieter.
Calm · Lively · Busy · Packed rank a day against San Diego's own year — not a headcount.
December sits between the seasons in San Diego: mild and showery, around 18°C / 64°F, Lively on 17 of 31 days — 14 days run Busy or Packed.
Mostly yes. The typical December day in San Diego is Lively, and 14 of the 31 days in our window run Busy or Packed. Expect around 18 °C by day, with rain on about 6 days. Public holidays in Canada and United States add to it. Cruise ships call on 5 of the 31 days, 2 at once on Wednesday 30 December. American Society for Cell Biology Annual Meeting falls on 12–16 December. Early December is the month's quietest stretch in San Diego — the typical day at 49%, against 81% in mid December. The crush is at the zoo's gates at holiday mid-morning; the quiet is at Coronado's long sand. The calmest day is Tuesday 1 December, the busiest Friday 4 December.
In short, a solid middle-ground pick.
Among the 12 months we forecast for San Diego, December ranks 4th for crowd pressure. Its heaviest day is Fri 4 Dec, busier than 99% of the year; its lightest is Tue 1 Dec at 49%.
⚠︎ Weekends run heavy — the 5th, 12th, 13th, 20th and 26th all sit Busy or Packed. If your dates can flex, a midweek arrival is the single easiest win.
Preparing pays off in a month like this: timed-entry tickets and pre-booked tours turn the queue time into sightseeing time. see the options →
Nothing extreme to plan around — rain on 6 of 31 days.
The one thing you wear all day, every day of the trip.
See walking shoes →
A folding one lives in the day bag and weighs nothing.
See umbrellas →
How busy is San Diego in December?
The busiest days are the 4th, 5th, 26th and 30th, and 10 more. Away from those, most days sit Lively. The calmest stretch is the 8th–11th.
Cruise ships are in port on 5 of 31 days; the heaviest is Wed 30 Dec, 2 ships in at once. Those mornings fill the squares first — start early, or save them for indoors.
The month is not one thing: its lightest day sits at 49% of the year and its heaviest at 99%, so where you land inside it matters. Daylight runs about 10 hours.
Either side of it, January is much calmer.
Weekends run heavy — the 5th, 12th, 13th, 20th and 26th all sit Busy or Packed. If your dates can flex, a midweek arrival is the single easiest win.
Tue 01 Dec Lively busier than 49% of days here
Record San Diego on Tue 1 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-01 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Wed 02 Dec Lively busier than 49% of days here
Record San Diego on Wed 2 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-02 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Thu 03 Dec Busy busier than 75% of days here · CSBA 2026 Annual Education Conference & Trade Show
Record San Diego on Thu 3 Dec 2026 is forecast Busy. Why: CSBA 2026 Annual Education Conference & Trade Show. Nearest calmer day: Wed 2 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-03 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Fri 04 Dec Packed busier than 99% of days here · Balboa Park December Nights · CSBA 2026 Annual Education Conference & Trade Show
Event on this day
4–5 Dec 2026Two December evenings when Balboa Park glows: food stalls, stages and free museums draw a third of a million San Diegans - and the roads around the park lock solid after dark.
Record San Diego on Fri 4 Dec 2026 is forecast Packed. Why: Balboa Park December Nights; CSBA 2026 Annual Education Conference & Trade Show. Nearest calmer day: Thu 3 Dec (Busy). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-04 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sat 05 Dec Packed busier than 99% of days here · Balboa Park December Nights · CSBA 2026 Annual Education Conference & Trade Show
Event on this day
4–5 Dec 2026Two December evenings when Balboa Park glows: food stalls, stages and free museums draw a third of a million San Diegans - and the roads around the park lock solid after dark.
Record San Diego on Sat 5 Dec 2026 is forecast Packed. Why: Balboa Park December Nights; CSBA 2026 Annual Education Conference & Trade Show. Nearest calmer day: Sun 6 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-05 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sun 06 Dec Lively busier than 49% of days here
Record San Diego on Sun 6 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-06 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Mon 07 Dec Packed busier than 90% of days here · ⚓1
- Zaandam — guest capacity 1,432
Record San Diego on Mon 7 Dec 2026 is forecast Packed. 1 cruise ship scheduled, at least 1,432 guests at double occupancy. Nearest calmer day: Sun 6 Dec (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-07 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Tue 08 Dec Lively busier than 49% of days here
Record San Diego on Tue 8 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-08 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Wed 09 Dec Lively busier than 49% of days here
Record San Diego on Wed 9 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-09 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Thu 10 Dec Lively busier than 49% of days here
Record San Diego on Thu 10 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-10 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Fri 11 Dec Lively busier than 49% of days here
Record San Diego on Fri 11 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-11 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sat 12 Dec Busy busier than 81% of days here · American Society for Cell Biology Annual Meeting
Record San Diego on Sat 12 Dec 2026 is forecast Busy. Why: American Society for Cell Biology Annual Meeting. Nearest calmer day: Fri 11 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-12 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sun 13 Dec Busy busier than 81% of days here · San Diego Bay Parade of Lights · American Society for Cell Biology Annual Meeting
Record San Diego on Sun 13 Dec 2026 is forecast Busy. Why: San Diego Bay Parade of Lights; American Society for Cell Biology Annual Meeting. Nearest calmer day: Fri 11 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-13 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Mon 14 Dec Busy busier than 81% of days here · American Society for Cell Biology Annual Meeting
Record San Diego on Mon 14 Dec 2026 is forecast Busy. Why: American Society for Cell Biology Annual Meeting. Nearest calmer day: Fri 11 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-14 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Tue 15 Dec Busy busier than 81% of days here · American Society for Cell Biology Annual Meeting
Record San Diego on Tue 15 Dec 2026 is forecast Busy. Why: American Society for Cell Biology Annual Meeting. Nearest calmer day: Thu 17 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-15 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Wed 16 Dec Busy busier than 81% of days here · American Society for Cell Biology Annual Meeting
Record San Diego on Wed 16 Dec 2026 is forecast Busy. Why: American Society for Cell Biology Annual Meeting. Nearest calmer day: Thu 17 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-16 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Thu 17 Dec Lively busier than 49% of days here
Record San Diego on Thu 17 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-17 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Fri 18 Dec Lively busier than 49% of days here
Record San Diego on Fri 18 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-18 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sat 19 Dec Lively busier than 49% of days here
Record San Diego on Sat 19 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-19 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sun 20 Dec Packed busier than 94% of days here · ⚓1 · San Diego Bay Parade of Lights
- Norwegian Star — guest capacity 2,348 07:00–16:00
Record San Diego on Sun 20 Dec 2026 is forecast Packed. 1 cruise ship scheduled, at least 2,348 guests at double occupancy; ships in port 07:00–16:00. Why: San Diego Bay Parade of Lights. Nearest calmer day: Sat 19 Dec (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-20 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Mon 21 Dec Busy busier than 79% of days here · ⚓1
- Crystal Serenity — guest capacity 740 07:00–19:00
Record San Diego on Mon 21 Dec 2026 is forecast Busy. 1 cruise ship scheduled, at least 740 guests at double occupancy; ships in port 07:00–19:00. Nearest calmer day: Tue 22 Dec (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-21 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Tue 22 Dec Lively busier than 49% of days here
Record San Diego on Tue 22 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-22 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Wed 23 Dec Busy busier than 84% of days here · SDCCU Poinsettia Bowl
Record San Diego on Wed 23 Dec 2026 is forecast Busy. Why: SDCCU Poinsettia Bowl. Nearest calmer day: Tue 22 Dec (Lively). The day in full, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-23 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Thu 24 Dec Lively busier than 49% of days here
Record San Diego on Thu 24 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-24 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Fri 25 Dec Lively busier than 58% of days here · United States public holiday
Record San Diego on Fri 25 Dec 2026 is forecast Lively. Why: United States public holiday; Canada public holiday. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-25 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sat 26 Dec Packed busier than 97% of days here · ⚓1 · Canada public holiday
- Koningsdam — guest capacity 2,650
Record San Diego on Sat 26 Dec 2026 is forecast Packed. 1 cruise ship scheduled, at least 2,650 guests at double occupancy. Why: Canada public holiday. Nearest calmer day: Fri 25 Dec (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-26 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Sun 27 Dec Lively busier than 49% of days here
Record San Diego on Sun 27 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-27 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Mon 28 Dec Lively busier than 49% of days here · Holiday Bowl
Record San Diego on Mon 28 Dec 2026 is forecast Lively. Why: Holiday Bowl. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-28 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Tue 29 Dec Lively busier than 49% of days here
Record San Diego on Tue 29 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-29 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Wed 30 Dec Packed busier than 97% of days here · ⚓2
- Costa Deliziosa — guest capacity 2,260 10:00–20:00
- Crystal Serenity — guest capacity 740 07:00–19:00
Record San Diego on Wed 30 Dec 2026 is forecast Packed. 2 cruise ships scheduled, at least 3,000 guests at double occupancy; ships in port 07:00–20:00. Nearest calmer day: Tue 29 Dec (Lively). Ship-by-ship detail for the day, the year at a glance, and what's worth booking ahead: https://avoid-crowds.com/san-diego/#d-2026-12-30 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Thu 31 Dec Lively busier than 49% of days here
Record San Diego on Thu 31 Dec 2026 is forecast Lively. The day in full, the year at a glance, and how this day compares: https://avoid-crowds.com/san-diego/#d-2026-12-31 (Avoid-Crowds, as of 2 Nov 2026; recomputed nightly.)
Which week of December is quietest in San Diego?
Early December is the month's quietest stretch in San Diego — the typical day at 49%, against 81% in mid December.
Can't move the dates? How to avoid the worst crowds
- The heaviest port day is Wed 30 Dec — 2 ships in at once. See the marquee sights on a lighter day, or be there for opening time.
- Need flexibility? The 8th–11th is the month's calmest stretch — the easiest window to move around in.
- On the busy days, the walk-up queues for the big sights are the biggest time-sink — a timed-entry ticket skips them, which is where a busy month is won or lost.
Travelling on a busy day?
Timed-entry and skip-the-line tickets turn queue time into sightseeing time — sort them before you fly.
December weather in San Diego
Mild — around 18°C / 64°F, with a light jacket for the evenings, with rain on about 6 days. Daylight is short, about 10 hours, so plan the big sights for the middle of the day.
Worth booking the marquee sights ahead for the busy days, but you can keep the rest of the trip flexible.
More about San Diego in December
Based on: United States' public holidays · the official airport-arrivals pattern (BTS T-100, measured 2023–2025; airport-arrivals proxy for visitor volume) · five years of weather records (2019–2023) · confirmed event dates · the published cruise schedule
Every figure is recomputed nightly from real cruise schedules, public and school holidays, and long-run climate normals. Gaps are shown, not filled.
